Taking an evidence-first big picture approach, Chemistry: Human Activity, Chemical Reactivity encourages students to think like a chemist, develop critical . 6 Nov P. Mahaffy, Canada, talks about the need to change the way of teaching chemistry and where he sees chemical education in 50 years. Peter Mahaffy. Overview. The context for the book Chemistry Education: Best Practices, Opportunities, and. Trends is set by this opening chapter, which.